A power transformer and monitoring system that optimizes cooling conditions

Abstract

A power transformer with optimized cooling conditions includes a support base, on which an iron core is mounted and clamped. A coil is fitted around the iron core, and adjusting pads and multi-effect pads are provided at both ends of the coil. Each multi-effect pad includes a fixing plate with a limiting plate. Guide elements are provided on both sides of the limiting plate, and the guide elements have openings facing the iron core. A hollow seat is also provided above the fixing plate, and an epoxy pad is placed above the hollow seat. The hollow seat has two air ports of different sizes, with the smaller port connected to a guide duct. The adjusting pad includes the hollow seat and the epoxy pad, and the height of the hollow seat is adjustable. The hollow seats, arranged vertically opposite each other, are connected to a circulation pipe for a circulating fan. Based on a conventional transformer structure, the existing limiting plate structure is utilized and expanded to enhance its function of heat treatment at the location of the low-voltage coil and iron core.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, specifically to a power transformer and monitoring system with optimized cooling conditions. Background Technology

[0002] To maintain the normal operation of a dry-type transformer, two parameters generally need to be monitored: temperature, which requires placing a temperature probe between the high-voltage and low-voltage coils; and pressure, which is typically monitored by embedding optical fibers in the pads supporting the high-voltage and low-voltage coils. By monitoring these two types of parameters, the overall operating status of the transformer can be basically monitored to ensure its normal operation and to shut it down promptly in case of any abnormality. For this purpose, a cooling fan is installed at the base of the transformer, and the fan blows vertically upwards, allowing airflow to exit from both the inside and outside of the high-voltage coil. Because the low-voltage coil is close to the iron core and the gap is small, it is impossible to provide sufficient ventilation channels, and conventional blower mechanisms are insufficient to handle the heat accumulation problem at the low-voltage coil. Summary of the Invention

[0003] To address the aforementioned problem that transformers cannot provide regional heat dissipation based on actual operating conditions, this invention provides a power transformer and monitoring system with optimized cooling conditions.

[0004] The technical solution of this invention is as follows: A power transformer with optimized cooling conditions includes a support base, on which an iron core is mounted. The upper and lower ends of the iron core are clamped and fixed by a clamping top frame and a clamping bottom frame, respectively. A low-voltage coil and a high-voltage coil are fitted around the iron core. Adjusting pads and multi-effect pads are provided between the low-voltage coil and the high-voltage coil and the clamping top frame and the clamping bottom frame. The multi-effect pad includes a fixing plate that is detachably connected to the clamping base frame. The fixing plate is vertically provided with a limiting plate near the iron core, and the upper part of the limiting plate is detachably connected to the clamping top frame. The limiting plate is provided with vertically extending guides on both sides, and the guides are also provided with vertical openings on the side facing the iron core. Hollow seats are also provided on the upper sides of the fixed plate. Epoxy pads supporting the low-voltage coil and the high-voltage coil are provided on the upper sides of the hollow seats. The hollow seats are provided with two air ports of different specifications, and the smaller air port is connected to a guide duct. The opening of the guide duct is vertically upward and located away from the opening of the guide component. The adjusting pad includes a hollow base and an epoxy pad, and the hollow base is fixed by bolts that vertically penetrate the clamping top frame, and its height position can be adjusted. Hollow seats arranged vertically opposite each other are connected to the circulation pipe of the circulating fan. The hollow seat of the adjusting pad is connected to the guide component of the multi-effect pad, and a negative pressure air duct corresponding to the guide air duct is set at the corresponding position.

[0005] Unlike conventional transformer structures, this design utilizes and expands upon existing limiting plate structures. In addition to limiting the position of the iron core, it also enables heat dissipation within the coil. Moreover, this structure, based on the limiting plate and placed between a single iron core and the low-voltage coil, does not affect the function and performance of the original transformer, and no additional installation structure is required.

[0006] The method for limiting the epoxy pad is as follows: vertical guide plates are symmetrically arranged above the hollow seat, epoxy pads are arranged between the guide plates, and the epoxy pads are higher than the guide plates and the height difference between them does not exceed 2% of the total height of the epoxy pads.

[0007] To monitor the creep of the epoxy pad, piezoelectric ceramics are installed on the side of the guide plate away from the hollow seat.

[0008] Unlike existing monitoring methods, the hollow seat is equipped with a monitoring probe that can monitor the temperature and air pressure inside the hollow seat cavity.

[0009] A monitoring system for a power transformer with optimized cooling conditions includes the aforementioned power transformer with optimized cooling conditions, and also includes an industrial control host. The input terminal of the industrial control host is connected to a monitoring probe, and the output terminal of the industrial control host is connected to a buzzer and a circulating fan.

[0010] To perform pressure monitoring, the industrial control host is configured with pressure anomaly detection logic, specifically as follows: When the real-time pressure value obtained by the industrial control host from the monitoring probe exceeds the preset pressure threshold, the buzzer will sound an alarm.

[0011] To regulate heat dissipation, the industrial control host is equipped with heat dissipation regulation logic, specifically as follows: The industrial control host acquires the real-time temperature value from the monitoring probe, and the speed of the circulating fan is positively correlated with the real-time temperature value.

[0012] The unique coupling monitoring method of this device is that the industrial control host pre-stores a set of temperature-pressure coupling threshold interval parameters, which includes normal operating condition coupling interval, early warning operating condition coupling interval, and high-risk fault coupling interval. The industrial control host receives real-time pressure and temperature parameters collected by the monitoring probe in real time, and matches the real-time pressure and temperature parameters at the same sampling time to form a real-time coupled parameter pair; The industrial control host compares and matches the real-time coupling parameter pair with the pre-stored temperature-pressure coupling threshold range parameter set, determines the coil operating condition based on the matched range, and outputs corresponding control / alarm commands.

[0013] To determine whether there is an abnormality, the industrial control host pre-stores a set of temperature-speed coupling threshold interval parameters, which includes normal operating condition coupling interval, early warning operating condition coupling interval, and high-risk fault coupling interval. The industrial control host receives real-time temperature parameters and real-time rotation speed parameters of the circulating fan collected by the monitoring probe in real time, and matches the real-time rotation speed parameters and real-time temperature parameters at the same sampling time to form a real-time coupled parameter pair; The industrial control host compares and matches the real-time coupling parameter pair with the pre-stored temperature-speed coupling threshold range parameter set, determines the coil operating condition based on the matched range, and outputs corresponding control / alarm commands.

[0014] The beneficial effects of this invention are as follows: This invention is a power transformer with optimized cooling conditions. Based on the existing transformer structure, the original limiting plate is expanded to add a current-conducting structure to its side. Based on the addition of the current-conducting structure, a unique independent heat dissipation structure located inside the coil is set up, which can assist in heat dissipation of independent phases and improve the problem of heat accumulation at the low-voltage coil. Then, based on the above structural design, the original fiber optic pressure measurement method is replaced by air pressure for pressure feedback, and the pressure change at different coil temperatures can be monitored. This facilitates the monitoring of the structural component status according to requirements and the implementation of corresponding response strategies. Attached Figure Description

[0015] The solutions and advantages of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0016] In the attached diagram: Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a top view of the structure of the present invention; Figure 3 This is a schematic diagram of the clamping base frame and multi-effect pad block structure of the present invention; Figure 4 This is a top view of the multi-effect pad block structure of the present invention; Figure 5 This is a schematic diagram of the multi-effect pad structure of the present invention; Figure 6 This is a schematic diagram of the limiting plate and flow guide of the present invention; Figure 7 This is a top view of the structure of the multi-effect pad block after disassembly and limiting plate and flow guide of the present invention; Figure 8 This is a schematic diagram of the multi-effect pad block structure of the present invention; The components represented by the various reference numerals in the diagram are: 1. Support base; 2. Clamping base frame; 3. Multi-functional pad; 31. Fixing plate; 32. Hollow base; 33. Monitoring probe; 34. Guide plate; 35. Limiting plate; 36. Flow guide; 37. Flow guide duct; 38. Epoxy pad; 4. Iron core; 5. Low voltage coil; 6. High voltage coil; 7. Adjusting pad; 8. Clamping top frame. Detailed Implementation

[0017] Example like Figure 1 , 2 The power transformer with optimized cooling conditions shown includes a support base 1 on which an iron core 4 is mounted. The iron core 4 is made of stacked silicon steel sheets. To restrict its movement, the upper and lower ends of the iron core 4 are clamped and fixed by a clamping top frame 8 and a clamping bottom frame 2, respectively. Based on this, a low-voltage coil 5 and a high-voltage coil 6 are fitted around the iron core 4. Further, an adjusting pad 7 and a multi-effect pad 3 are provided between the low-voltage coil 5 and the high-voltage coil 6 and the clamping top frame 8 and the clamping bottom frame 2, wherein the adjusting pad 7 is located on the upper side and the multi-effect pad 3 is located on the lower side.

[0018] Among them, such as Figure 3-5 As shown, the multi-effect pad 3 includes a fixing plate 31 detachably connected to the clamping base 2. All subsequent structural components are set based on the fixing plate 31. Therefore, the entire multi-effect pad 3 can be installed after the fixing plate 31 is fixed relative to the clamping base 2. A limiting plate 35 is vertically provided on the fixing plate 31 near the iron core 4. The limiting plate 35 is used to clamp the iron core, and it is detachably connected to the clamping top frame 8 at its upper position. Therefore, it can also achieve tensioning and fixing of the clamping top frame 8 and the clamping base 2. The difference from existing structures is that guide members 36 are provided on both sides of the limiting plate 35 to guide the flow. Component 36 is the core feature of this application. Its structural features do not need to be added separately, but are extended based on the basic structure of the limiting plate 35. The guide component 36 is vertically arranged and has a vertically penetrating channel. In addition, it has an opening facing the iron core 4, and the opening is constricted, that is, the width of the opening is less than the total width of the guide component 36. Based on the above structure, a vertical ventilation channel can be formed. In addition to the upper and lower openings, the ventilation channel also has an opening on the side facing the iron core. Based on this, when the air flow velocity in the channel of the guide component 36 is relatively fast, air can be introduced from the side, which can improve and solve the problem of heat accumulation in the direction of the iron core.

[0019] Furthermore, a hollow seat 32 is provided above the fixing plate 31. An epoxy pad 38 supporting the low-voltage coil 5 and the high-voltage coil 6 is provided above the hollow seat 32. The structure of the epoxy pad 38 will not be described further; its purpose is to support the coils. A noteworthy feature is that, unlike conventional epoxy pads 38 which are placed directly above the clamping base 2, the epoxy pad 38 in this application is supported by a hollow seat 32. The hollow seat 32 has two air ports of different sizes, with the smaller port connected to a guide duct 37. The air port is equipped with a solenoid valve for controlling its opening and closing. The opening of the guide duct 37 is vertically upward and positioned on the guide member 36 away from the opening; it is used for air outlet. In a preferred embodiment, the diameter of the air guide duct 37 is 1 / 4 of the total width of the air guide 36 and is disposed close to the edge. The opening of the air guide 36 facing the iron core 4 is located in the middle and occupies 1 / 2 of the total width of the air guide 36. Based on this, the airflow from the air guide duct 37 can be collected, ensuring that the airflow ejected can be vertically collected by the air guide duct 36, while also generating negative pressure due to high flow velocity at the opening. Based on this, the air outlet path is located on the channel formed by the air guide 36. Compared with the open air outlet method, this fixed-path air outlet method can significantly improve the airflow velocity. The increased velocity can significantly reduce the heat accumulation problem of the low-voltage coil.

[0020] Subsequently, the adjusting pad 7 includes a hollow seat 32 and an epoxy pad 38. The hollow seat 32 is fixed by bolts that pass through the clamping top frame 8. The height position can be adjusted. The height position adjustment is used to adapt to the installation of the overall structure. The purpose is also to adjust the height of the epoxy pad 38. The difference from the existing adjustable epoxy pad 38 is the addition of structures such as the hollow seat 32, but the purpose and requirements have not changed.

[0021] After setting the above structure, the hollow seats 32 arranged vertically are connected to the circulation pipe of the circulating fan. That is, the hollow seat 32 of the adjusting pad 7 is set with a negative pressure air duct corresponding to the air duct 37 at the guide 36. In this way, the circulating air intake and exhaust can be realized. Based on this, the high-speed airflow in the entire ventilation channel can be realized. Based on the high-speed airflow at this location, negative pressure can be generated and used to alleviate the heat accumulation problem. The reason for setting the above structure is that the space between the low-voltage coil and the iron core is very limited. Directly adding a structure would have a significant impact on the device. However, adding the guide 36 on the basis of the original limit plate 35 avoids the above problem. First, the strength of the limit plate 35 itself will be improved. Moreover, the guide 36 and the limit plate 35 can be disassembled and assembled synchronously. The installation position and installation method still use the original limit plate 35, without the need to improve the existing structure.

[0022] The above structure can achieve the following: based on the existing conventional transformer structure, the existing limiting plate 35 structure is utilized and expanded. In addition to limiting the position of the iron core 4, it is also used to achieve heat dissipation inside the coil, which can improve the heat accumulation problem at the iron core of the existing transformer. Moreover, the above structure is placed between the single iron core and the low-voltage coil 5, and relies on the structural deformation of the conventional transformer limiting plate 35. Therefore, it has no impact on the function and effect of the original transformer.

[0023] Furthermore, in the above structure, the epoxy pad 38 is limited by a vertical guide plate 34 above the hollow base 32, with the epoxy pad 38 positioned between the guide plates 34 and limited by the guide plates 34 to prevent movement. The height difference between the epoxy pad 38 and the guide plate 34 does not exceed 2% of the total height of the epoxy pad 38. Based on this, in order to monitor the creep of the epoxy pad 38, a piezoelectric ceramic is provided on the side of the guide plate 34 away from the hollow base 32. When the epoxy pad 38 creeps and decreases in height, if it can contact the guide plate 34, the piezoelectric ceramic will be triggered, thus enabling the monitoring function. Alternatively, if it is not creep but a problem with the equipment, causing the epoxy pad 38 to be deformed under pressure beyond the threshold, and causing the iron core to directly contact the guide plate 34, the piezoelectric ceramic can also generate electricity, and the subsequent operation system can be triggered by this electrical signal.

[0024] Finally, unlike existing monitoring methods, the hollow seat 32 is equipped with a monitoring probe 33, which can monitor the temperature and air pressure inside the cavity of the hollow seat 32. After the hollow seat 32 is deformed by pressure, its internal space will change, thereby changing the internal air pressure. Therefore, the pressure status can be fed back through the air pressure.

[0025] Finally, a monitoring system for power transformers with optimized cooling conditions was designed for the above-mentioned device. The system includes the power transformer with optimized cooling conditions and an industrial control host. The input terminal of the industrial control host is connected to the monitoring probe 33, and the output terminal of the industrial control host is connected to a buzzer and a circulating fan.

[0026] To perform pressure monitoring, the industrial control host is configured with pressure anomaly detection logic, specifically as follows: When the industrial control host obtains the real-time pressure value of the monitoring probe 33 and it exceeds the preset pressure threshold, the buzzer alarms. In order to ensure that the monitoring probe 33 can feed back pressure information, the internal cavity of a single hollow seat 32 will deform after being pressed. Based on this, pressure information can be fed back, and based on the change in pressure information, it can be determined whether the coil has a problem.

[0027] Subsequently, in order to regulate heat dissipation, the industrial control host is equipped with heat dissipation regulation logic, specifically as follows: The industrial control host acquires the real-time temperature value from the monitoring probe 33, and adjusts the speed of the circulating fan in a manner positively correlated with the real-time temperature value. A faster flow rate generates a corresponding negative pressure, which in turn drives the hot air away from the area between the low-voltage coil and the iron core, thus resolving the heat accumulation problem.

[0028] The unique coupling monitoring method of this device is that the industrial control host pre-stores a set of temperature-pressure coupling threshold interval parameters, which includes normal operating condition coupling interval, early warning operating condition coupling interval, and high-risk fault coupling interval. The industrial control host receives real-time pressure and temperature parameters collected by the monitoring probe 33 in real time, and matches the real-time pressure and temperature parameters at the same sampling time to form a real-time coupled parameter pair. Both pressure and temperature parameters can be directly obtained through the monitoring probe 33. The temperature is different from that of the temperature measuring rod set between the coils. Instead, during the airflow circulation process, the opening of the guide 36 facing the iron core can draw in the high-temperature gas, which can then be reflected as different internal temperatures of the cavity in the hollow seat 32 and displayed as the real-time temperature.

[0029] Based on this, the industrial control host compares and matches the real-time coupling parameter pair with the pre-stored temperature-pressure coupling threshold range parameter set, determines the coil operating condition according to the matching range, and outputs the corresponding control / alarm command.

[0030] Finally, to determine whether there is an anomaly, the industrial control host pre-stores a set of temperature-speed coupling threshold interval parameters. This set includes normal operating condition coupling intervals, early warning operating condition coupling intervals, and high-risk fault coupling intervals. The speed refers to the rotational speed of the circulating fan. Theoretically, the higher the rotational speed, the greater the airflow velocity within the guide pipe 36. This method can improve the ability to reduce heat accumulation. Therefore, if the temperature difference is greater under the same rotational speed, it indicates a problem with the equipment, and a fault can be determined.

[0031] Therefore, the industrial control host receives the real-time temperature parameters and real-time speed parameters of the circulating fan collected by the monitoring probe 33 in real time, and matches the real-time speed parameters and real-time temperature parameters at the same sampling time to form a real-time coupled parameter pair; The industrial control host compares and matches the real-time coupling parameter pair with the pre-stored temperature-speed coupling threshold range parameter set, determines the coil operating condition based on the matching range, and outputs corresponding control / alarm commands. Based on this, the operating status of the equipment can be determined according to the special speed and temperature parameters of this application.

Claims

1. A power transformer with optimized cooling conditions, characterized in that, Includes a support base (1), on which an iron core (4) is provided, and the upper and lower ends of the iron core (4) are clamped and fixed by a clamping top frame (8) and a clamping bottom frame (2) respectively. The iron core (4) is fitted with a low-voltage coil (5) and a high-voltage coil (6). An adjusting pad (7) and a multi-effect pad (3) are provided between the low-voltage coil (5) and the high-voltage coil (6) and the clamping top frame (8) and the clamping bottom frame (2). The multi-effect pad (3) includes a fixing plate (31) detachably connected to the clamping base frame (2). The fixing plate (31) has a limiting plate (35) vertically installed near the iron core (4), and the limiting plate (35) is detachably connected to the clamping top frame (8) at the upper position. The limiting plate (35) has vertically installed guide members (36) that pass through vertically on both sides. The guide members (36) also have a vertical opening on the side facing the iron core (4). Hollow seats (32) are also provided on both sides of the fixed plate (31). Epoxy pads (38) supporting the low-voltage coil (5) and the high-voltage coil (6) are provided on the hollow seats (32). The hollow seats (32) are provided with two air ports of different specifications, and the smaller air port is connected to the guide duct (37). The opening of the guide duct (37) is vertically upward and is located away from the opening of the guide component (36). The adjusting pad (7) includes a hollow seat (32) and an epoxy pad (38), and the hollow seat (32) is fixed by bolts that penetrate vertically through the clamping top frame (8), and its height position can be adjusted; Hollow seats (32) arranged vertically are connected to the circulation pipe of the circulating fan. The hollow seat (32) of the adjusting pad (7) is connected to the guide (36) of the multi-effect pad (3), and a negative pressure air duct corresponding to the guide air duct (37) is set at the corresponding position.

2. The power transformer with optimized cooling conditions according to claim 1, characterized in that, Vertical guide plates (34) are symmetrically arranged above the hollow seat (32), and epoxy pads (38) are arranged between the guide plates (34). The epoxy pads (38) are higher than the guide plates (34) and the height difference between them does not exceed 2% of the total height of the epoxy pads (38).

3. A power transformer with optimized cooling conditions according to claim 1, characterized in that, The guide plate (34) is provided with piezoelectric ceramics on the side away from the hollow seat (32).

4. A power transformer with optimized cooling conditions according to claim 1, characterized in that, The hollow seat (32) is provided with a monitoring probe (33), and the monitoring probe (33) can monitor the temperature and air pressure inside the cavity of the hollow seat (32).

5. A monitoring system for power transformers with optimized cooling conditions, characterized in that, The power transformer with optimized cooling conditions as described in claim 4 also includes an industrial control host, the input end of which is connected to the monitoring probe (33), and the output end of which is connected to a buzzer and a circulating fan.

6. A monitoring system for power transformers with optimized cooling conditions according to claim 5, characterized in that, The industrial control host is equipped with pressure anomaly detection logic, specifically: When the real-time pressure value of the monitoring probe (33) obtained by the industrial control host exceeds the preset pressure threshold, the buzzer will sound an alarm.

7. A monitoring system for optimizing cooling conditions of a power transformer according to claim 5, characterized in that, The industrial control host is equipped with heat dissipation regulation logic, specifically as follows: The industrial control host obtains the real-time temperature value of the monitoring probe (33), and adjusts and controls the rotation speed of the circulating fan, which is positively correlated with the real-time temperature value.

8. A monitoring system for power transformers with optimized cooling conditions according to claim 5, characterized in that, The industrial control host pre-stores a set of temperature-pressure coupling threshold interval parameters, which includes normal operating condition coupling interval, early warning operating condition coupling interval, and high-risk fault coupling interval. The industrial control host receives real-time pressure parameters and real-time temperature parameters collected by the monitoring probe (33) in real time, and matches the real-time pressure parameters and real-time temperature parameters at the same sampling time to form a real-time coupled parameter pair; The industrial control host compares and matches the real-time coupling parameter pair with the pre-stored temperature-pressure coupling threshold range parameter set, determines the coil operating condition based on the matched range, and outputs corresponding control / alarm commands.

9. A monitoring system for optimizing cooling conditions of a power transformer according to claim 5, characterized in that, The industrial control host pre-stores a set of temperature-speed coupling threshold interval parameters, which includes normal operating condition coupling interval, early warning operating condition coupling interval, and high-risk fault coupling interval. The industrial control host receives the real-time temperature parameters and real-time speed parameters of the circulating fan collected by the monitoring probe (33) in real time, and matches the real-time speed parameters and real-time temperature parameters at the same sampling time to form a real-time coupled parameter pair; The industrial control host compares and matches the real-time coupling parameter pair with the pre-stored temperature-speed coupling threshold range parameter set, determines the coil operating condition based on the matched range, and outputs corresponding control / alarm commands.

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